/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kie.dmn.core.impl;

import java.util.HashSet;
import java.util.Set;

import org.kie.dmn.api.core.DMNRuntime;
import org.kie.dmn.api.core.event.DMNRuntimeEventListener;
import org.kie.dmn.api.core.event.DMNRuntimeEventManager;

public class DMNRuntimeEventManagerImpl implements DMNRuntimeEventManager {

    private Set<DMNRuntimeEventListener> listeners = new HashSet<>();

    private DMNRuntime dmnRuntime;

    public DMNRuntimeEventManagerImpl() {

    }

    public DMNRuntimeEventManagerImpl(DMNRuntime dmnRuntime) {
        this.dmnRuntime = dmnRuntime;
    }

    @Override
    public void addListener(DMNRuntimeEventListener listener) {
        if( listener != null ) {
            this.listeners.add( listener );
        }
    }

    @Override
    public void removeListener(DMNRuntimeEventListener listener) {
        this.listeners.remove( listener );
    }

    @Override
    public Set<DMNRuntimeEventListener> getListeners() {
        return listeners;
    }

    @Override
    public boolean hasListeners() {
        return !listeners.isEmpty();
    }

    @Override
    public DMNRuntime getRuntime() {
        return dmnRuntime;
    }

}
